Dental engine



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DENTAL ENGINE.

1\Io3401,.23'1. vPatemted. July l.. 1884.

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VVOCDBURY S. IIOV, OE PHILADELPHIA, PENNSYLVANIA, ASSIGNCR TO TI-IE S. S. IVHITE DENTAL MANUFACTURING COMPANY, CE PENNSYLVANIA.

DENTAL ENGINE...

SPECIFICATION forming part of Letters Patent No. 301,237, dated July l, 1884.

Application sied July is, 1ers. l

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Be it known that I, VooDURY S.A How, formerly of Cincinnati, Ohio, but now residing in the city of Philadelphia, Pennsylvania,

5 have invented certain new and nseful Improvements in Dental Engines, of which the following is a specification.

My invention relates more particularly to dental engines of the class provided with an io upright standard carrying at its upper end a power-driven shaft, by which motion is communicated to the operating-tool.

I-Ieretofore the standards of dental engines have been either rigid, so as to constitute con- I 5 tinuations of the pedestal or base of the engine, or such standards have been pivoted at their lower ends about the axis of the ordinary drive-pulley, so as to be capable of a rocking movement in the plane of the drive-wheel,

2o and are acted upon by a spring or springs,

which maintain the engine-standard in a normally upright or vertical position. The object of this rocking movement of the standard is to give a wider range of action to the en- 2 5 gine and greater freedom of movement to the power-driven shaft by which the operatingtool is revolved. After much experience with the use of dental engines in the practice of dentistry, I have found it desirable not only 3o to give the standardaroclzing movement across the axis of, and in the plane of, the drivingpulley, but also to enable said standard, or a portion thereof, to be rocked or moved crosswise of the plane of motion of the pulley, or,

in other words, at right angles, or substantially so, to the usual rocking movement of the standard. By this organization a superior engine is produced, because thc driven pulley at the upper end of the standard, which 4o imparts motion to the operating-tool through a driven shaft, may be brought in front of the patient seated in the operating-chair without bringing the engine-base inconveniently close to said chair, whereby a wide range of movement is given to the engine and great freedom imparted to the usual flexible shaft, which constitutes the power-conveyer between the driven pulley at the upper end of the standard and the operating-tool. This universal 5o motion to be imparted to the engine-standard has heretofore been attained by hinging the standard by a double-jointed or universal connection at or near the aXis of the driving-pulley; but such double-jointed connection is a spring connection, whereby the standard, whether rocked in the line of the rotation of the driving-pulley or crosswise thereof, is returned as soon as the strain is removed to an upright or vertical position. Such a doublejointed standard is shown in C. P. Grouts 6o Patent N o. 125,809, of 1872. There are serious defects, however, in said Grouts device,

in that there is no capability in the rocking or jointed standard of being moved out of the perpendicular and then locked, so as to prevent its return to a vertical position. This is a very important feature, and in this feature my invention broadly consists. So, also, Grout employs friction-gearing with his double rocking connection, which is an impracticable 7e form for the purpose, all engines of this class in use being driven by a belt from the main driving-pulley. I am the first, as far as I am aware, ever to have provided a dental-engine base with an upright standard which can be movedout of the perpendicular to any angle desired and then locked, so as to prevent its return to an upright position when released from the power which causes the rocking or iiexing movement of the standard.

My invention also consists in other improvements, which are particularly recited at the close of the specication. Y

In the accompanying drawings, which illustrate my improvements as embodied in the best way now known to me, Pigurel is a view in elevation (looking at the edge of the driving-pulley) ofso much of a dental engine as is necessary to illustrate my improvements, the pedestal being rigidly extended above the go driving-pulley to receive a9 connection with the rocking standard. Fig. 2 is an elevation (looking in a direction at right angles to that of Fig. l) of so much of an engine as is necessary to illustrate my improvements, tlieengine in this instance being provided with a standard hinged at` or about the axis of the driving-pulley, so as to be rocked back and forth and retained in a normal position by a1 spring, and said standard being :also jointed 10o above said driving-pulley, so as to be moved l the engine-standard is pivoted about the axis or rocked at right angles to the movement first described, or, in other words, across the plane of rotation of the driving-pulley. Fig. 3 is a view of the crosswise-rocking connection detached, and constituting an attachment for application to engines in common use.

The base or pedestal of the engine may be of the usual construction, with an .upright portion, A, in or on which the driving-pulley B is mounted to turn and be driven, for instance, by a trcadle movement, as usual. In the example shown in Fig. l the pedestal A is extended above the driving-pulley, and is fitted with a tubular'horizontal axis, C, in a line with the plane oi' revolution of the drivingpulley. rlhe standard D is fitted or hinged upon said axis C, so as to be rocked crosswise of said axis, or, in other words, crosswise oi' the plane of revolution of the driving-pulley, as clearly shown in Fig. 8. rIhe normal position of the standard D will be vertical; but when it is desired to bring the upper end of the standard in front of the patient, said `standard will be rocked upon its aXis to the desired extent. lWhen so rocked or moved out of the perpendicular, said standard maybe locked by suitable spring-catches, E E, which take into locking-notches d in the lower end or eX- tension of the standard D, as clearly shown in Figs. l and Said springs constitute an automatic locking device.

The driven pulley F, with which the usual power-conveyer is connected at the upper end of the engine-arm, receives the driving-belt Gr, whichpasses from the driving-pulley B. As long as the standard is in an upright position a properly-fitted driving-belt would remain operative; but were, not provision made it is obvious that upon rocking the standard out of the perpendicular the belt would become slack, and would be disengaged from the pulleys, and would not continue in an operative condition.

In order to enable the standard and pulley at its upper end to be rocked crosswise to the desired position, and the engine to remain operative, I have provided guides H H for the belt in a line with the axis or joint C upon which the standard is turned. This beltguide consists, preferably, of adjustable arms having eyes h 7i at their outer ends which receive the belt. Said arms are fitted to slide back and forth in the tubular axis upon which the standard rocks, or is capable 'of being turned crosswise, and by means of a set-screw may be locked in" the desired position, in order to insure the proper working of the belt. It is now obvious that, notwithstanding the crosswise rocking movement of the standard, the belt will remain taut and in an operative condition. In place of the plain eyes at the outer ends of the adjustable arms, band-pulleys may be employed, over which the belt may work.

In the engine shown in Fig. 2 the pedestal terminates at or about the driving-pulley, and

of said pulley, so as to be capable of rocking Ifreely back and forth in the direction of the line of ,rotation of said pulley, the standard being acted upon by a spring, as usual in such cases, to maintain the standard ina normally upright position and to return it to such position when the rocking strain upon the standard has been removed.

Between the pivotal connection of the standard with the pedestal or base and the driven pulley at the upper end of said standard the standard is provided with the crosswise rocking connection, before described, and locking devices, whereby the upper end of the standard and driven connections thereat may be brought over in front of the patient While seatedin the operating-chair and the standard locked in this bent or adjusted position. As shown in Fig. 2, therefore, it will be understood that the standard has what is tantamount to a universal-joint movement with a capability of being rocked out of the perpendicular and locked or fastened in such position. In Fig. 3 I have shown the crossvvise rocking connection as detached and in the shape of an attachment to be applied todental engines now in use. rlhe lower end of the attachment is socketedV and threaded to be screwed upon a portion of the standard of an ordinary engine, while the upper end is likewise threaded to receive the upper portion of said ordinary standard,whereby it will be understood that the rocking joint constitutes a part of the standard, which will then be capable of the movements and adjustments before described.

Having thus described my improvements, I claim hereinl. rlhe dental-engine base or pedestal having a jointed or tilting standard movable out ofthe perpendicular, in combination With locking mechanism, whereby the standard, when moved or adjusted out of the perpendicular, may be looked or held in such adjusted position, substantially as described. A

2. rlhe dental-engine base or pedestal having a jointed or tilting standard movable out of the perpendicular, in combination with an IOO IIO

automatic locking device, whereby the standard may be moved or adjusted out of the perpendicular and locked in such adjusted position, substantially as described.

8. A dentalengine standard or upright jointed to the base or pedestal above the driving-pulley of the engine, in combination with a driving-belt and guides therefor, whereby the upper end of the standard may be moved out of the perpendicular without destroying the proper operative condition of the drivingbelt.

4. A dental engine standard or upright jointed to the base or pedestal above the driving-pulley ofthe engine, in combination ywith a driving-belt and adjustable guides therefor, substantially as described.

5. Au engine standard or upright jointed at its lower end to the base and provided above neetion7 the upper and lower ends of which said joint with an additional joint, in combiare provided With means for attachment to the 10 nation with locking,` mechanism for said lastmembers of said standard, substantially as deinentioned joint, whereby the upper end of the scribed.

5 standard may be moved ont ofthe perpendicu- WOODBURY STORER HOV.

lar and locked in its adjusted position. Vitnesses:

6. The attachment for dental engine up- L. M. HOSEA, rights or standards, consisting of a jointed con- Jol-IN NV. HILL. 

